Automatic transmissions are a thing of wonder. Very few people know how automatic gearboxes actually work, and even fewer people have the knowledge to tear down and rebuild one. Hagerty put together this awesome time lapse of an automatic transmission being rebuilt, and boy does it look complicated.

According to the video's description, this particular transmission—taken from an early 1960s Ford Thunderbird—was in need of a rebuild thanks to worn out seals, gaskets, and clutch packs. Unlike a simpler manual transmission, an auto 'box is full of tiny pieces and complex mechanisms whose operation even we have trouble understanding.

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As you'll see in the video below, it takes expert mechanics an obscene amount of time to disassemble, clean, and rebuild the three-speed transmission. Thankfully, the nice folks over at Hagerty have condensed the process down into five minutes of sped-up video for us to enjoy, just as they did with a Chrysler Firepower V8 rebuild back in December. If you can't keep up with all the parts flying across the screen, don't worry, neither can we.